Stock feed mechanism



Nov. 4, 1941. A. F. JELINEK ETAL 2,261,378

STOCK FEED MECHANISM Filed March 4, 1940 4 Sheets-Sheet 1 INVENTORJ OAZFREDf-ZJEL/NEK M44762 E. 620 55 TTORNEYS.

Nov. 4, 1941. A. F. JELINEK ETAL STOCK FEED MECHANISM Filed March 4,1940 4 Sheets-Sheet 2 1NVENTOR5 Al/KEDE J'EL l/VEK WHZTER E. GROSS f/ 7MORNEYS Nov. 4, 1941.

A. F. JELINEK EI'AL STOCK FEED MECHANISM Filed March 4, 1940 4 She ei.s-Sheet 3 INVENTORS ALFRED/57E L NEK 62065 M v WALTEEE. /5

N v. 4, 19 1- A. F. JELINEK ETAL 2,251,378

STOCK FEED MECHANISM 4 Sheets-Sheet 4 Filed March 4, 1940 INVENTORSFPEDfiJfZ/Nfk WALTER E. 6!?053 @r TTORNEY-S Patented Nov. 4, 1941 STOCKFEED MECHANISM Alfred F. Jelinek and Walter E. Gross, Cleveland, Ohio,assignors to The Cleveland Automatic Machine Company, Cleveland, Ohio, acorporation of Ohio Application March 4, 1940,v Serial N 0. 322,184

3 Claims.

This invention relates broadly to automatic screw machines and morespecifically to improvements in stock feed mechanisms therefor.

One of the objects of the invention is to provide a cam followersupporting structure which may be readily adjusted in relation to thelift of the cam to vary the travel or longitudinal movement of themechanism controlled thereby.

Another object of the invention is to construct a stock feed tubeassembly which is designed to facilitate the ready removal thereof indismantling the tube for the purpose of replacement of bearings orsimilar wear parts in the assembly.

Another object of the invention is to provide a cam drum mounting whichis constructed to accommodate rotative adjustments thereof in order toalter-the timed relation of the cam plates mounted thereon with themechanisms coordinated therewith.

Other objects and advantages more or less ancillary to the foregoing andthe manner in which all the various objects are realized will appear inthe following description.

Referring to the drawings wherein the preferred embodiment of theinvention is illustrated:

Fig. 1 is a side elevational view of an automatic screw machineembodying the present invention;

Fig. 2 is a horizontal section through the spindle head of the machineand a fragmentary portion of the cam shaft housing, the section beingtaken on the plane indicated by the line 2-2 in Fig. l;

Fig. 3 is a vertical sectional view through the end portion of thespindle head and cam shaft housing, the section being taken on the planeindicated by the line 3-3 in Fig. 2;

Fig. 4 is a vertical sectional View through the spindle housing, thesection being taken on the plane indicated by the line 44 in Fig. 2;

Fig. 5 is a longitudinal section of a fragmentary portion of the stockfeed actuating mechanism,

the section being taken on the plane indicated by As illustrated in Fig.1, the screw machine All chosen herein for purposes of illustrationcomprises a base I0, having a housing H mounted thereon, adapted tosupport the work. holding spindle l2 and drive mechanism therefor andconstructed also to enclose the journal'bearings and driving connectionscoordinated with the cam shaft l3.

As will be seen in Fig.2, the outer end of the cam shaft is providedwith a cylinder or drum l4 having cam plates I5 mounted thereon whichare operatively associated with a follower l 6 supported on a sleeve I"!slidably mounted upon a rod l8 retained within the housing H. The sleeveI1 is formed with a yoke l9 (see (Fig. 6) upon the forward face thereof,which is engaged with a groove formed in the hub of the collet actuatingcone member 2|. Since the work holding collet and operating mechanismtherefor comprises per se no part of the present invention it is deemedunnecessary herein to describe the specific construction thereof indetail other than to state that the operation thereof is effectedthrough the reciprocative movement of the sleeve H, which in turn causesthe longitudinal movement of the wedge rings 23 and 24 and theconsequent reciprocative movement of the actuating tube 25 for the workholding collet Adjacent the cam Hi there is a second drum 2! having acam plate 28 mounted thereon which is configured to effect the maximumtranslation of the stock feed mechanism contemplated in the design ofthe machine. The cam plate 28 is engaged with a roller 29 mounted uponablock I'll) A (see Fig. 4) which is attached to a side 3| mounted forreciprocative movement upon the rod l8. The slide is formed with aT-slot 32 in a face thereof provided for the reception of bolts 33 toaccommodate lineal adjustment of the block when it is desired to alterthe position of the roller in relation to the inclined face of the cam28.

The slide 3| is formed with a laterally extended arm 34 having anenlarged annular end portion 34a which is bored for the reception of asleeve 35 machined to support an anti-friction bearing 36 (Fig. 7). Theouter race of the bearing is clamped between ashoulder 31 formed in thesleeve 35 and a threaded ring 38 which is locked in position within thesleeve by a set screw 39. The innerrace of the bearing 36 is impingedbetween a nut 40 and a shoulder 4| formed in a thimble 42 which iswelded to the outer end of the stock feed tube 43. The mouth of thethimble 42 isbored to support the bar stock guide bushing, as iscustomary in machines of this type, which is retained therein by a setscrew. The enlarged end portion of the arm 34 is formed with a slot 44in the upper face thereof for the reception of an arcuate arm 45 (Fig.4) pivotally supported upon a pin 46. The arm 45 is 'constructed with aboss in the free end thereof which is slotted for the reception of apivotally mounted bolt 4'! provided for the retention of the arm in itsclosed position. The periphery of the sleeve 35 is machined with agroove 48 having the side walls thereof tapered for engagement with theinclined sides of the inner face of the arm 45.

The slide 3| (see Fig. 4) is formed with an arm 49 depending from thebody thereof and constructed with a bifurcated end portion which engagesa rod 5|] to restrain the slide from rotation upon the rod I8. The rod50 is supported in a bracket 5| mounted upon the end Wall of the housingI and within an opening in a transverse wall or partition formed in thecentral portion of the spindle housing. The bracket 5| is constructedWith a boss 52 drilled to support the outer end of a guide rod 53 whichis disposed within a tube 54 welded in the arm 45 and guided in an arm|9a depending from the yok IS. The tube 54 is provided with a bushing 55in the end thereof which constitutes a guiding member for the rod 53 andan abutment for the end of a spring 56, the spring mounted upon theguide rod 53 being partially encased by the tube 54 and compressivelyretained between the bushing 55 and a collar 51 mounted upon the rod 53.The collar 5'! is clamped to the rod by means of a set screw in order tofacilitate longitudinal adjustments thereof so that the compressiveeffort of the spring 56 may be regulated to urge the slide 3| intoabutting engagement with a stop 58 mounted upon the rod I8.

The cam drums I4 and 21 are formed with hubs 65 which are bored torotate freely upon the cam shaft |3. The outer machined faces of thehubs are disposed in abutting engagement with split collars 6| which areclamped upon the cam shaft by bolts 62 retained within laterallyextended bosses 63. The contiguous faces of the collars and hub portions6|] of the drums are drilled and reamed for the reception of dowel pins54 which constitute driving connections between the drums and collarsrespectively.

In operation the roller 29 is retained in spring pressed engagement withthe inclined face of the cam 28 through the compression spring 56 whichbears against the bushing 55 and urges the tube 54 and in turn the slide3| against the stop 58. As the cam drum 21 is revolved the inclined faceof the cam 23 effects the translation of the slide 3| and the consequentmovement of the stock feed tube 43 (Fig. 2). When it is desired to alterthe length of the reciprocative movement of the stock feed tube 43, i.e. change the stroke of the stock feed mechanism, the bolts 33supporting the block 30 are released, and While the slide is heldagainst the stop 58 by the spring 56, the block is repositionedlongitudinally along the T-slot 32 until the roller 29 engages only suchportion of the inclined face 65 of the cam 28 as may be required toeffect the desired translation of the slide. Thereupon the bolts 33 aretightened to hold the block in rigid securement upon the slide 3|. Infurther detail, when the roller block is adjusted to its maximum innerposition contact between the roller and the cam face 55 will be madesubstantially throughout the entire rotative cycle of the cam 28, butwhen the block 30 is positioned adjacent the outer end of the slide 3|only a portion of the cam face will be engaged by the roller and onlysuch portion of the cam lift will be realized as is required to effectthe desired movement of the slide 32 and in turn the requiredtranslation of the stock feed tube 43.

Since the spring 56 constantly urges the slide 3| against the stop 58,changes in the position of the roller relative to the cam face willalter the eifective lift of the cam. Thus when the block 30 is movedfrom the position illustrated in Fig. 2 to the position where thewitness mark A on the block is aligned with the point D indicated on thegraduated scale S on the slide, the cam follower roller 23 will firststrike the working edge of the cam plate 28 at the point (I as the drumis revolved about its axis. Obviously, the resulting translation of theslide will be limited to the movement effected by the cam lift from thepoint (2 to the peak f of the cam face 55. Likewise, when the block ismoved so that the mark A will register with the point C only the portionof the cam lift from the point 0 to 1 will be employed and when theblock is moved to the position where the mark A is registered with thepoint B the segment of the cam from point a to b will rotate past theroller 29 before any movement of the slide 32 may be effected.

As the position of the cam follower supporting block 30 is alteredcompensative adjustments of the cam drums l4 and 2'! must likewise bemade in order to preserve the timed relation of operation between twomechanisms. This adjustment may be effected by merely loosening the nuts62, then rotating the collars and drums upon the cam shaft to the pointwhere engagement of the cam shoulders with the rollers i6 and 2!]respectively will effect the coordinated relation of the stock feedmechanism with the closure of the work holding collet 26 and the timedorder of operation of tools carried by the tool turret 66 and crossslide 61- The construction of the stock feed tube mounting, as providedherein, is designed to accommodate the manipulation of the bar stock toeffect the entry thereof through the spring jaws in in the stock feedtube with greater facility and dispatch. In the execution of thisoperation the pivoted arm 45 is first released and retracted from thegroove 48 so that the sleeve assembly, including the stock feed tube 43may be Withdrawn from the slide. The operator may, thereupon, slightlywithdraw the assembly and in the exercise of short reciprocativemovement bump the nut 45 against the shell of the enlarged portion 34aof the arm 34 until the bar stock spreads the jaws 13 in the feed tubeand is extended therethrough to the desired position. The arm 45 is thenrepositioned within the groove 48, the tapered side walls thereofeffecting the centralization of the sleeve with running clearancebetween the nut 40 and the inner shell of the arm.

Although the foregoing description is necessarily of a detailedcharacter, in order that the invention may be completely set forth, itis to be understood that the specific terminology is not intended to berestrictive or confining and that various rearrangements of parts andmodifications of detail may be resorted to without departing from thescope or spirit of the invention as herein claimed.

We claim:

1. A screw machine embodying a gear housing, a work holding spindle anda cam shaft, a cam on said shaft, a rod mounted in said housing,

a slide reciprocatively mounted on said rod, a laterally extending armon said slide, a stock feed tube connected to said arm and slidablymounted in said Work holding spindle, a second rod mounted in saidhousing, a yoke depending from said slide engaged with said second rod,a ledge on said slide having a T slot therein, a block on said ledge,bolts in said block engaged in said T slot, a roller on said blockengaged with said cam, a spring mounted on said housing normally urgingsaid slide towards said cam, a sleeve on said stock feed tube having anannular groove therein and an arcuate arm hinged upon said laterallyextending arm and engaged in said groove for the retention of said stockfeed tube.

2. A screw machine embodying a gear housing, a work holding spindle anda cam shaft, a cam on said shaft, a rod mounted in said housing, a slidereciprocatively mounted on said rod, a laterally extending arm on saidslide, a stock feed tube connected to said arm and slidably mounted insaid work holding spindle, a second rod mounted in said housing, a yokedepending from said slide engaged with said second rod, a ledge on saidslide having a T slot therein, a block on said ledge, bolts in saidblock engaged in said T slot, a roller on said block engaged with saidcam, a spring mounted on said housing normally urging said slide towardssaid cam and means on said cam shaft for adjusting said camcircumferentially about said shaft.

3. Ascrew machine embodying a gear housing, a work holding spindle and acam shaft, a cam on said shaft, a rod mounted in said housing, a slidereciprocatively mounted on said rod, a laterally extending arm on saidslide, a stock feed tube connected to said arm and slidably mounted insaid work holding spindle, a second rod mounted in said housing, a yokedepending from said slide engaged with said second rod, for restrainingthe slide from arcuate movement upon the first named rod, a block onsaid slide, a roller on said block engaged with said cam, means in saidslide for clamping said block thereon, a third rod mounted in saidhousing, a spring thereon normally urging said slide towards said cam,and an anti-friction bearing secured upon said stock laterally extendingarm on said slide.

ALFRED F. JELINEK. WALTER E. GROSS.

